Repeat accumulate code combines the advantages of both Turbo and LDPC codes,and becomes a hot topic in recent years,because it has the same linear encoding method as Turbo codes and is similar to LDPC codes in the linear decoding algorithm.In order to improve the performance of repeat accumulate codes,this paper optimized the design of interleaver.It designed a parity block interleaver based on several common interleavers and analyzed the performance of the BP decoding algorithm in the AWGN channel.The simulation results show that the performance of the parity block interleaver is better than that of the block interleaver.Compared with block interleaver,the parity block interleaver reduces the correlation between information sequences greatly,avoids the generation of two kinds of four rings in the check matrix,and improves the reliability of information transmission in the channel.%重复累积码(Repeat Accumulate Code,简称RA码)综合了Turbo码和LDPC码的优点,可以进行线性时间的编码及译码,成为了近年来信道编码技术研究的热点.为了改善重复累积码的性能,对其交织器进行优化设计.在几种常见的交织器的基础上提出了奇偶分组交织器的设计方法,并在AWGN信道下基于BP译码算法完成性能分析.仿真结果表明,奇偶分组交织器优于分组交织器,大大降低了信息序列之间的相关性,同时避免了校验矩阵中两类四环的产生,可以提高信息在信道中传输的可靠性.
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